This research was implemented by the phenomenological research method targeting 7 social welfare workers to investigate the elements and types according to ethical decision making of social workers' ethics who work at social welfare site. The research results according to the research object are, first, ethical management guideline in social welfare institute is merely a formality, though it was established as operational regulation or articles of association, and the education for social welfare ethics was an obligation, however qualitative satisfaction on education or development of various educational method are required. Second, in the decision making direction for a dilemma situation of social welfare, ethical absolutism established the hypotheses of ‘social justice’, ‘un(超)moral’, ‘moral behavior decision for the generalization of defense-orient’. Ethical relativism established the hypotheses of ‘paternalistic’, ‘behavior decision for the generalization of religious aim’. Third, common features among ‘social workers' ethical decision making factors were ‘the principle of life protection’ and ‘welfare workers’ ‘personal moral sense' as social workers, and the different points were the moral characteristics as the motivation by ‘social justice’ and ‘fairness’, ‘regulation of social system’, ‘other-directed, conventional, universal’, and ‘result center’ in ethical absolutism and in ethical relativism, moral characteristics as the motivation by ‘secret security’, ‘protective role’, ‘client and relation center’, and ‘individual subjectivity center’ appeared.